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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..7b99f601f6986b9e61f9897f7771bfc2b980f7a4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,23 @@
+# Query Converter
+This is the query-conversion package. It holds the code that translates the JSON of the visual query to the selected database language. There are currently two implementations, one for the Arango Query Language and one for Cypher.
+
+## Creating a new converter
+```go
+import "git.science.uu.nl/datastrophe/query-conversion"
+
+queryservice := cypher.NewService()
+```
+
+## Converting a query
+A query can be made by providing the JSON of the visual query and feeding it into the `ConvertQuery` function.
+
+```go
+query, err := queryservice.ConvertQuery(JSONquery)
+```
+
+## Creating a mock converter
+```go
+import "git.science.uu.nl/datastrophe/query-conversion"
+
+mockService := NewMockService()
+```
\ No newline at end of file
diff --git a/aql/convertQuery.go b/aql/convertQuery.go
index af2101807517bf27155d34b7ec8cd749c0acfedc..87d4a01221d57db6b34cc4b7f2dcdeb9e47bf94f 100644
--- a/aql/convertQuery.go
+++ b/aql/convertQuery.go
@@ -1,3 +1,8 @@
+/*
+This program has been developed by students from the bachelor Computer Science at Utrecht University within the Software Project course.
+© Copyright Utrecht University (Department of Information and Computing Sciences)
+*/
+
 package aql
 
 import (
@@ -48,10 +53,10 @@ func (s *Service) ConvertQuery(JSONQuery *entity.IncomingQueryJSON) (*string, er
 	return result, nil
 }
 
-/* createQuery generates a query based on the json file provided
-Parameters: jsonQuery is a parsedJSON struct holding all the data needed to form a query
-
-Return: a string containing the corresponding AQL query and an error
+/*
+createQuery generates a query based on the json file provided
+	JSONQuery: *entity.IncomingQueryJSON, this is a parsedJSON struct holding all the data needed to form a query,
+	Return: *string, a string containing the corresponding AQL query and an error
 */
 func createQuery(JSONQuery *entity.IncomingQueryJSON) *string {
 	// Note: Case #4, where there is an edge only query (without any entity), is not supported by frontend
@@ -246,11 +251,11 @@ func createQuery(JSONQuery *entity.IncomingQueryJSON) *string {
 	return &ret
 }
 
-/* createNodeLet generates a 'LET' statement for a node related query
-Parameters: node is an entityStruct containing the information of a single node,
-name is the autogenerated name of the node consisting of "n" + the index of the node
-
-Return: a string containing a single LET-statement in AQL
+/*
+createNodeLet generates a 'LET' statement for a node related query
+	node: *entity.QueryEntityStruct, node is an entityStruct containing the information of a single nod,
+	name: *string, is the autogenerated name of the node consisting of "n" + the index of the node,
+	Return: *string, a string containing a single LET-statement in AQL
 */
 func createNodeLet(node *entity.QueryEntityStruct, name *string) *string {
 	header := fmt.Sprintf("LET %v = (\n\tFOR x IN %v \n", *name, node.Type)
@@ -261,12 +266,12 @@ func createNodeLet(node *entity.QueryEntityStruct, name *string) *string {
 	return &ret
 }
 
-/* createRelationLetWithFromEntity generates a 'LET' statement for relations with an 'EntityFrom' property and optionally an 'EntitiyTo' property
-Parameters: relation is a relation struct containing the information of a single relation,
-name is the autogenerated name of the node consisting of "r" + the index of the relation,
-entities is a list of entityStructs that are needed to form the relation LET-statement
-
-Return: a string containing a single LET-statement in AQL
+/*
+createRelationLetWithFromEntity generates a 'LET' statement for relations with an 'EntityFrom' property and optionally an 'EntitiyTo' property
+	relation: *entity.QueryRekationStruct, relation is a relation struct containing the information of a single relation,
+	name: string, is the autogenerated name of the node consisting of "r" + the index of the relation,
+	entities: *[]entity.QueryEntityStrucy, is a list of entityStructs that are needed to form the relation LET-statement,
+	Return: *string, a string containing a single LET-statement in AQL
 */
 func createRelationLetWithFromEntity(relation *entity.QueryRelationStruct, name string, entities *[]entity.QueryEntityStruct, limit int) *string {
 	header := fmt.Sprintf("LET %v = (\n\tFOR x IN n%v \n", name, relation.EntityFrom)
@@ -296,12 +301,12 @@ func createRelationLetWithFromEntity(relation *entity.QueryRelationStruct, name
 	return &ret
 }
 
-/* createRelationLetWithOnlyToEntity generates a 'LET' statement for relations with only an 'EntityTo' property
-Parameters: relation is a relation struct containing the information of a single relation,
-name is the autogenerated name of the node consisting of "r" + the index of the relation,
-entities is a list of entityStructs that are needed to form the relation LET-statement
-
-Return: a string containing a single LET-statement in AQL
+/*
+createRelationLetWithOnlyToEntity generates a 'LET' statement for relations with only an 'EntityTo' property
+	relation: *entity.QueryRelationStruct, relation is a relation struct containing the information of a single relation,
+	name: string, is the autogenerated name of the node consisting of "r" + the index of the relation,
+	entities: *[]entity.QueryEntityStruct, is a list of entityStructs that are needed to form the relation LET-statement,
+	Return: *string, a string containing a single LET-statement in AQL
 */
 func createRelationLetWithOnlyToEntity(relation *entity.QueryRelationStruct, name string, entities *[]entity.QueryEntityStruct, limit int) *string {
 	header := fmt.Sprintf("LET %v = (\n\tFOR x IN n%v \n", name, relation.EntityTo)
diff --git a/aql/convertQueryBenchmark_test.go b/aql/convertQueryBenchmark_test.go
index b1ba7b7b6537c0a9ce571c60e5698b73967fa223..2506fe36b12162bc8e9d2b9f577be8896d3ee83a 100644
--- a/aql/convertQueryBenchmark_test.go
+++ b/aql/convertQueryBenchmark_test.go
@@ -1,3 +1,8 @@
+/*
+This program has been developed by students from the bachelor Computer Science at Utrecht University within the Software Project course.
+© Copyright Utrecht University (Department of Information and Computing Sciences)
+*/
+
 package aql
 
 import (
@@ -7,6 +12,10 @@ import (
 	"git.science.uu.nl/datastrophe/query-conversion/entity"
 )
 
+/*
+Benchmarks converting an empty query
+	t: *testing.T, makes go recognise this as a test
+*/
 func BenchmarkConvertEmptyQuery(b *testing.B) {
 	// Setup for test
 	// Create query conversion service
@@ -33,6 +42,10 @@ func BenchmarkConvertEmptyQuery(b *testing.B) {
 	}
 }
 
+/*
+Benchmarks converting a one attribute query
+	t: *testing.T, makes go recognise this as a test
+*/
 func BenchmarkConvertOneAttributeQuery(b *testing.B) {
 	// Setup for test
 	// Create query conversion service
@@ -52,7 +65,7 @@ func BenchmarkConvertOneAttributeQuery(b *testing.B) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -73,6 +86,10 @@ func BenchmarkConvertOneAttributeQuery(b *testing.B) {
 	}
 }
 
+/*
+Benchmarks converting a two relation query
+	t: *testing.T, makes go recognise this as a test
+*/
 func BenchmarkConvertTwoRelationQuery(b *testing.B) {
 	// Setup for test
 	// Create query conversion service
@@ -97,7 +114,7 @@ func BenchmarkConvertTwoRelationQuery(b *testing.B) {
 					{
 						"attribute": "city",
 						"value": "New York",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -108,7 +125,7 @@ func BenchmarkConvertTwoRelationQuery(b *testing.B) {
 					{
 						"attribute": "city",
 						"value": "San Francisco",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -119,7 +136,7 @@ func BenchmarkConvertTwoRelationQuery(b *testing.B) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -138,7 +155,7 @@ func BenchmarkConvertTwoRelationQuery(b *testing.B) {
 					{
 						"attribute": "Day",
 						"value": "15",
-						"dataType": "number",
+						"dataType": "int",
 						"matchType": "EQ"
 					}
 				]
diff --git a/aql/convertQuery_test.go b/aql/convertQuery_test.go
index 44917c8ff658f9c43ec182cd9653c26fc99ba8f5..65c891864dc52c895fc3bb152e8672a7d3ecb515 100644
--- a/aql/convertQuery_test.go
+++ b/aql/convertQuery_test.go
@@ -1,3 +1,8 @@
+/*
+This program has been developed by students from the bachelor Computer Science at Utrecht University within the Software Project course.
+© Copyright Utrecht University (Department of Information and Computing Sciences)
+*/
+
 package aql
 
 import (
@@ -10,6 +15,10 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+/*
+Tests an empty query
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestEmptyQueryConversion(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -41,6 +50,11 @@ LET edges = first(RETURN UNION_DISTINCT([],[]))
 RETURN {"vertices":nodes, "edges":edges }`
 	assert.Equal(t, correctConvertedResult, *convertedResult)
 }
+
+/*
+Tests multiple entity types
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestMultipleEntityTypes(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -116,6 +130,10 @@ func TestMultipleEntityTypes(t *testing.T) {
 	assert.Equal(t, convertedCleanedResult, cleanedResult)
 }
 
+/*
+Tests a query with one attribute
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestEntityOneAttributeQuery(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -135,7 +153,7 @@ func TestEntityOneAttributeQuery(t *testing.T) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -161,6 +179,10 @@ func TestEntityOneAttributeQuery(t *testing.T) {
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
 
+/*
+Test a relation with a constraint
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestRelationWithConstraint(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -182,7 +204,7 @@ func TestRelationWithConstraint(t *testing.T) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -201,7 +223,7 @@ func TestRelationWithConstraint(t *testing.T) {
 					{
 						"attribute": "Day",
 						"value": "15",
-						"dataType": "number",
+						"dataType": "int",
 						"matchType": "EQ"
 					}
 				]
@@ -226,6 +248,10 @@ func TestRelationWithConstraint(t *testing.T) {
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
 
+/*
+Tests the count modifier
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestModifierCountEntity(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -245,7 +271,7 @@ func TestModifierCountEntity(t *testing.T) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -278,6 +304,11 @@ func TestModifierCountEntity(t *testing.T) {
 	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
+
+/*
+Tests the count modifer with an attribute
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestModifierCountEntityAttribute(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -297,7 +328,7 @@ func TestModifierCountEntityAttribute(t *testing.T) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -330,6 +361,11 @@ func TestModifierCountEntityAttribute(t *testing.T) {
 	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
+
+/*
+Tests the count modifier on a relation
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestModifierCountRelation(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -351,7 +387,7 @@ func TestModifierCountRelation(t *testing.T) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -370,7 +406,7 @@ func TestModifierCountRelation(t *testing.T) {
 					{
 						"attribute": "Day",
 						"value": "15",
-						"dataType": "number",
+						"dataType": "int",
 						"matchType": "EQ"
 					}
 				]
@@ -402,6 +438,11 @@ func TestModifierCountRelation(t *testing.T) {
 	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
+
+/*
+Tests the count modifier with an entity swap
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestModifierCountEntitySwap(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -465,6 +506,11 @@ func TestModifierCountEntitySwap(t *testing.T) {
 	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
+
+/*
+Tests the count modifier on a relation and attribute
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestModifierCountRelationAttribute(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -486,7 +532,7 @@ func TestModifierCountRelationAttribute(t *testing.T) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -505,7 +551,7 @@ func TestModifierCountRelationAttribute(t *testing.T) {
 					{
 						"attribute": "Day",
 						"value": "15",
-						"dataType": "number",
+						"dataType": "int",
 						"matchType": "EQ"
 					}
 				]
@@ -538,6 +584,10 @@ func TestModifierCountRelationAttribute(t *testing.T) {
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
 
+/*
+Tests a relation with an in out constraint
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestRelationWithInOutConstraint(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -560,7 +610,7 @@ func TestRelationWithInOutConstraint(t *testing.T) {
 					{
 						"attribute": "city",
 						"value": "San Francisco",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -571,7 +621,7 @@ func TestRelationWithInOutConstraint(t *testing.T) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -590,7 +640,7 @@ func TestRelationWithInOutConstraint(t *testing.T) {
 					{
 						"attribute": "Day",
 						"value": "15",
-						"dataType": "number",
+						"dataType": "int",
 						"matchType": "EQ"
 					}
 				]
@@ -615,6 +665,10 @@ func TestRelationWithInOutConstraint(t *testing.T) {
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
 
+/*
+Tests two relations
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestTwoRelations(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -639,7 +693,7 @@ func TestTwoRelations(t *testing.T) {
 					{
 						"attribute": "city",
 						"value": "New York",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -650,7 +704,7 @@ func TestTwoRelations(t *testing.T) {
 					{
 						"attribute": "city",
 						"value": "San Francisco",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -661,7 +715,7 @@ func TestTwoRelations(t *testing.T) {
 					{
 						"attribute": "state",
 						"value": "HI",
-						"dataType": "text",
+						"dataType": "string",
 						"matchType": "exact"
 					}
 				]
@@ -680,7 +734,7 @@ func TestTwoRelations(t *testing.T) {
 					{
 						"attribute": "Day",
 						"value": "15",
-						"dataType": "number",
+						"dataType": "int",
 						"matchType": "EQ"
 					}
 				]
@@ -715,6 +769,10 @@ func TestTwoRelations(t *testing.T) {
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
 
+/*
+Tests a relation with only a to node
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestRelationWithOnlyToNode(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -736,7 +794,7 @@ func TestRelationWithOnlyToNode(t *testing.T) {
 						{
 							"attribute": "city",
 							"value": "San Francisco",
-							"dataType": "text",
+							"dataType": "string",
 							"matchType": "exact"
 						}
 					]
@@ -773,6 +831,10 @@ func TestRelationWithOnlyToNode(t *testing.T) {
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
 
+/*
+Tests too manu return entities
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestTooManyReturnEntities(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -796,7 +858,7 @@ func TestTooManyReturnEntities(t *testing.T) {
 						{
 							"attribute": "city",
 							"value": "San Francisco",
-							"dataType": "text",
+							"dataType": "string",
 							"matchType": "exact"
 						}
 					]
@@ -827,6 +889,10 @@ func TestTooManyReturnEntities(t *testing.T) {
 	assert.Equal(t, errors.New("non-existing entity referenced in return"), err)
 }
 
+/*
+Tests too manu return relations
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestTooManyReturnRelations(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -850,7 +916,7 @@ func TestTooManyReturnRelations(t *testing.T) {
 						{
 							"attribute": "city",
 							"value": "San Francisco",
-							"dataType": "text",
+							"dataType": "string",
 							"matchType": "exact"
 						}
 					]
@@ -881,6 +947,10 @@ func TestTooManyReturnRelations(t *testing.T) {
 	assert.Equal(t, errors.New("non-existing relation referenced in return"), err)
 }
 
+/*
+Tests negative return entities
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestNegativeReturnEntities(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -905,7 +975,7 @@ func TestNegativeReturnEntities(t *testing.T) {
 						{
 							"attribute": "city",
 							"value": "San Francisco",
-							"dataType": "text",
+							"dataType": "string",
 							"matchType": "exact"
 						}
 					]
@@ -936,6 +1006,10 @@ func TestNegativeReturnEntities(t *testing.T) {
 	assert.Equal(t, errors.New("non-existing entity referenced in return"), err)
 }
 
+/*
+Tests a query with no relation field
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestNoRelationsField(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -954,7 +1028,7 @@ func TestNoRelationsField(t *testing.T) {
 						{
 							"attribute": "city",
 							"value": "San Francisco",
-							"dataType": "text",
+							"dataType": "string",
 							"matchType": "exact"
 						}
 					]
@@ -979,6 +1053,10 @@ func TestNoRelationsField(t *testing.T) {
 	assert.Equal(t, correctConvertedResult, cleanedResult)
 }
 
+/*
+Tests an entity with a lower than -1 in a relation
+	t: *testing.T, makes go recognise this as a test
+*/
 func TestEntityFromLowerThanNegativeOneInRelation(t *testing.T) {
 	// Setup for test
 	// Create query conversion service
@@ -1000,7 +1078,7 @@ func TestEntityFromLowerThanNegativeOneInRelation(t *testing.T) {
 						{
 							"attribute": "city",
 							"value": "San Francisco",
-							"dataType": "text",
+							"dataType": "string",
 							"matchType": "exact"
 						}
 					]
diff --git a/aql/createConstraints.go b/aql/createConstraints.go
index cdc9891d56705ae75fbac1d28b96a95eac7799d6..0a6c8ed08fca24bbe593323320a6b7b505fcb605 100644
--- a/aql/createConstraints.go
+++ b/aql/createConstraints.go
@@ -46,12 +46,12 @@ func createConstraintBoolExpression(constraint *entity.QueryConstraintStruct, na
 	)
 
 	// Constraint datatypes back end
-	// text		  MatchTypes: EQ/NEQ/contains/excludes
-	// number     MatchTypes: EQ/NEQ/GT/LT/GET/LET
+	// string		  MatchTypes: EQ/NEQ/contains/excludes
+	// int     MatchTypes: EQ/NEQ/GT/LT/GET/LET
 	// bool       MatchTypes: EQ/NEQ
 
 	switch constraint.DataType {
-	case "text":
+	case "string":
 		value = fmt.Sprintf("\"%s\"", constraint.Value)
 		switch constraint.MatchType {
 		case "NEQ":
@@ -65,7 +65,7 @@ func createConstraintBoolExpression(constraint *entity.QueryConstraintStruct, na
 		default: //EQ
 			match = "=="
 		}
-	case "number":
+	case "int":
 		value = constraint.Value
 		switch constraint.MatchType {
 		case "NEQ":
diff --git a/aql/mockConvertQuery.go b/aql/mockConvertQuery.go
index 3c0ffbf8209f2c7624d44c6e7937ea9e214ab585..5f82c691a8cc7477ca6faecb09e7c644f684d295 100644
--- a/aql/mockConvertQuery.go
+++ b/aql/mockConvertQuery.go
@@ -1,3 +1,8 @@
+/*
+This program has been developed by students from the bachelor Computer Science at Utrecht University within the Software Project course.
+© Copyright Utrecht University (Department of Information and Computing Sciences)
+*/
+
 package aql
 
 import (
@@ -6,19 +11,28 @@ import (
 	"git.science.uu.nl/datastrophe/query-conversion/entity"
 )
 
-// A MockService implements the query convert usecase interface (mock)
+/*
+A MockService implements the query convert usecase interface (mock)
+*/
 type MockService struct {
 	throwError bool
 }
 
-// NewMockService creates a new query convert service (mock)
+/*
+NewMockService creates a new query convert service (mock)
+	Return: *MockService, returns a mock service
+*/
 func NewMockService() *MockService {
 	return &MockService{
 		throwError: false,
 	}
 }
 
-// ConvertQuery returns a hard coded string message (mock)
+/*
+ConvertQuery returns a hard coded string message (mock)
+	JSONQuer: *entity.IncomingQueryJSON, the incoming query in JSON format
+	Return: (*string, error), the result and a potential error
+*/
 func (s *MockService) ConvertQuery(JSONQuery *entity.IncomingQueryJSON) (*string, error) {
 	mockQuery := "Query converted"
 
@@ -28,7 +42,9 @@ func (s *MockService) ConvertQuery(JSONQuery *entity.IncomingQueryJSON) (*string
 	return nil, errors.New("Failed to convert query")
 }
 
-// ToggleError decides whether the convert function throws an error
+/*
+ToggleError decides whether the convert function throws an error
+*/
 func (s *MockService) ToggleError() {
 	s.throwError = !s.throwError
 }
diff --git a/cypher/convertQuery.go b/cypher/convertQuery.go
new file mode 100644
index 0000000000000000000000000000000000000000..3a89ec88c6b66c76c5fe716180db9247d8ac8715
--- /dev/null
+++ b/cypher/convertQuery.go
@@ -0,0 +1,243 @@
+/*
+This program has been developed by students from the bachelor Computer Science at Utrecht University within the Software Project course.
+© Copyright Utrecht University (Department of Information and Computing Sciences)
+*/
+
+package cypher
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"git.science.uu.nl/datastrophe/query-conversion/entity"
+)
+
+/*
+ConvertQuery converts an IncomingQueryJSON object into AQL
+	JSONQuery: *entity.IncomingQueryJSON, the query to be converted to AQL
+	Returns: (*string, error), the AQL query and a possible error
+*/
+func (s *Service) ConvertQuery(JSONQuery *entity.IncomingQueryJSON) (*string, error) {
+
+	// Check to make sure all indexes exist
+	// How many entities are there
+	numEntities := len(JSONQuery.Entities) - 1
+	// How many relations there are
+	numRelations := len(JSONQuery.Relations) - 1
+
+	// Make sure no entity should be returned that is outside the range of that list
+	for _, e := range JSONQuery.Return.Entities {
+		// If this entity references an entity that is outside the range
+		if e > numEntities || e < 0 {
+			return nil, errors.New("non-existing entity referenced in return")
+		}
+	}
+
+	// Make sure that no relation mentions a non-existing entity
+	for _, r := range JSONQuery.Relations {
+		if r.EntityFrom > numEntities || r.EntityTo > numEntities {
+			return nil, errors.New("non-exisiting entity referenced in relation")
+		}
+	}
+
+	// Make sure no non-existing relation is tried to be returned
+	for _, r := range JSONQuery.Return.Relations {
+		if r > numRelations || r < 0 {
+			return nil, errors.New("non-existing relation referenced in return")
+		}
+	}
+
+	result := createQuery(JSONQuery)
+	return result, nil
+}
+
+/*
+sliceContains checks if a slice contains the input
+	s: []int, the slice to check
+	e: int, what you're checking for
+	Return: bool, true if it contains 'e'
+*/
+func sliceContains(s []int, e int) bool {
+	for _, a := range s {
+		if a == e {
+			return true
+		}
+	}
+	return false
+}
+
+/*TrimSuffix trims the final character of a string */
+func TrimSuffix(s, suffix string) string {
+	if strings.HasSuffix(s, suffix) {
+		s = s[:len(s)-len(suffix)]
+	}
+	return s
+}
+
+/*
+createQuery generates a query based on the json file provided
+	JSONQuery: *entity.IncomingQueryJSON, jsonQuery is a parsedJSON struct holding all the data needed to form a query
+	Return: *string, a string containing the corresponding AQL query and an error
+*/
+func createQuery(JSONQuery *entity.IncomingQueryJSON) *string {
+	// Note: Case #4, where there is an edge only query (without any entity), is not supported by frontend
+
+	// If a modifier is used, disable the limit
+	if len(JSONQuery.Modifiers) > 0 {
+		JSONQuery.Limit = -1
+	}
+
+	var (
+		relationsToReturn []string
+		nodesToReturn     []string
+		nodeUnion         string
+		relationUnion     string
+		queryList         [][][]int
+		entityList        []int
+		ret               string
+	)
+
+	for i, relation := range JSONQuery.Relations {
+		var contains bool
+		contains = false
+		for j := range queryList {
+			if sliceContains(queryList[j][0], relation.EntityFrom) || sliceContains(queryList[j][0], relation.EntityTo) {
+				if !sliceContains(queryList[j][0], relation.EntityFrom) {
+					queryList[j][0] = append(queryList[j][0], relation.EntityFrom)
+					entityList = append(entityList, relation.EntityFrom)
+				}
+				if !sliceContains(queryList[j][0], relation.EntityTo) {
+					queryList[j][0] = append(queryList[j][0], relation.EntityTo)
+					entityList = append(entityList, relation.EntityTo)
+				}
+				queryList[j][1] = append(queryList[j][1], i)
+				contains = true
+			}
+		}
+		if !contains {
+			queryList = append(queryList, [][]int{{relation.EntityFrom, relation.EntityTo}, {i}})
+		}
+	}
+
+	for i := range queryList {
+		//reset variables for the next query
+		nodeUnion = ""
+		relationUnion = ""
+		relationsToReturn = []string{}
+		for j, relationID := range queryList[i][1] {
+			relationName := fmt.Sprintf("r%v", j)
+			relation := JSONQuery.Relations[relationID]
+			pathName := fmt.Sprintf("p%v", j)
+			relationsToReturn = append(relationsToReturn, pathName)
+			if relation.EntityFrom >= 0 {
+				// if there is a from-node
+				// create the let for this node
+				fromName := fmt.Sprintf("n%v", relation.EntityFrom)
+
+				ret += *createNodeMatch(&JSONQuery.Entities[relation.EntityFrom], &fromName)
+
+				ret += *createRelationMatch(&relation, relationName, pathName, &JSONQuery.Entities, JSONQuery.Limit, true)
+			} else if relation.EntityTo >= 0 {
+				// if there is only a to-node
+				toName := fmt.Sprintf("n%v", relation.EntityTo)
+
+				ret += *createNodeMatch(&JSONQuery.Entities[relation.EntityTo], &toName)
+
+				ret += *createRelationMatch(&relation, relationName, pathName, &JSONQuery.Entities, JSONQuery.Limit, false)
+				// Add this relation to the list
+			} else {
+				fmt.Println("Relation-only queries are currently not supported")
+				continue
+			}
+		}
+
+		// Create UNION statements that create unique lists of all the nodes and relations
+
+		// Thus removing all duplicates
+		nodeUnion = "RETURN "
+
+		for _, entityID := range queryList[i][0] {
+			if sliceContains(JSONQuery.Return.Entities, entityID) {
+				nodeUnion += fmt.Sprintf("n%v,", entityID)
+			}
+		}
+
+		for _, relation := range relationsToReturn {
+			relationUnion += fmt.Sprintf("%v,", relation)
+		}
+
+		relationUnion = TrimSuffix(relationUnion, ",")
+		// hier zat een newline
+		ret += nodeUnion + relationUnion + "; "
+	}
+
+	nodeSet := make(map[int]bool)
+	for _, relation := range JSONQuery.Relations {
+		nodeSet[relation.EntityFrom] = true
+		nodeSet[relation.EntityTo] = true
+	}
+
+	// Check if the entities to return are already returned
+	for _, entityIndex := range JSONQuery.Return.Entities {
+		if !nodeSet[entityIndex] {
+			// If not, return this node
+			name := fmt.Sprintf("n%v", entityIndex)
+			ret += *createNodeMatch(&JSONQuery.Entities[entityIndex], &name)
+			// Add this node to the list
+			nodesToReturn = append(nodesToReturn, name)
+			ret += fmt.Sprintf("RETURN %v", name)
+		}
+	}
+
+	ret = TrimSuffix(ret, " ")
+	return &ret
+}
+
+/*
+createNodeLet generates a 'LET' statement for a node related query
+	node: *entity.QueryEntityStruct, node is an entityStruct containing the information of a single node,
+	name: *string, is the autogenerated name of the node consisting of "n" + the index of the node
+	Return: *string, a string containing a single LET-statement in AQL
+*/
+func createNodeMatch(node *entity.QueryEntityStruct, name *string) *string {
+	// hier zat een newline
+	header := fmt.Sprintf("MATCH (%v:%v) ", *name, node.Type)
+	constraints := *createConstraintStatements(&node.Constraints, *name)
+	ret := header + constraints
+	return &ret
+}
+
+/*
+createRelationLetWithFromEntity generates a 'LET' statement for relations with an 'EntityFrom' property and optionally an 'EntitiyTo' property
+	relation: *entity.QueryRelationStruct, relation is a relation struct containing the information of a single relation,
+	relationName: string, is the name of the relation, is the autogenerated name of the node consisting of "r" + the index of the relation,
+	pathName: string, is the path of the name,
+	entities: *[]entity.QueryEntityStruct, is a list of entityStructs that are needed to form the relation LET-statement
+	limit: int, the limit for the number of nodes to return
+	outbound: bool, checks if the relation is inbound or outbound
+	Return: *string, a string containing a single LET-statement in AQL
+*/
+func createRelationMatch(relation *entity.QueryRelationStruct, relationName string, pathName string, entities *[]entity.QueryEntityStruct, limit int, outbound bool) *string {
+	relationReturn := ""
+	var relationBounds int
+	if outbound {
+		relationReturn = fmt.Sprintf("MATCH %v = (n%v)-[%v:%v*%v..%v]->(", pathName, relation.EntityFrom, relationName, relation.Type, relation.Depth.Min, relation.Depth.Max)
+		relationBounds = relation.EntityTo
+
+	} else {
+		relationReturn = fmt.Sprintf("MATCH %v = (n%v)-[%v:%v*%v..%v]->(", pathName, relation.EntityTo, relationName, relation.Type, relation.Depth.Min, relation.Depth.Max)
+		relationBounds = relation.EntityFrom
+	}
+
+	if relationBounds != -1 {
+		relationReturn += fmt.Sprintf("n%v", relationBounds)
+	}
+	relationReturn += ")"
+
+	constraintReturn := *createConstraintStatements(&relation.Constraints, relationName)
+	// hier zat een newline
+	ret := relationReturn + " " + constraintReturn
+
+	return &ret
+}
diff --git a/cypher/convertQueryBenchmark_test.go b/cypher/convertQueryBenchmark_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..3794ab92a7434af21c8fcc34fb640a6d1d789f3a
--- /dev/null
+++ b/cypher/convertQueryBenchmark_test.go
@@ -0,0 +1,169 @@
+package cypher
+
+import (
+	"encoding/json"
+	"testing"
+
+	"git.science.uu.nl/datastrophe/query-conversion/entity"
+)
+
+func BenchmarkConvertEmptyQuery(b *testing.B) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+		"return": {
+			"entities": [],
+			"relations": []
+		},
+		"entities": [],
+		"relations": [],
+		"limit": 5000
+	}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		service.ConvertQuery(&JSONQuery)
+	}
+}
+
+func BenchmarkConvertOneAttributeQuery(b *testing.B) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+		"return": {
+			"entities": [
+				0
+			],
+			"relations": []
+		},
+		"entities": [
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "state",
+						"value": "HI",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			}
+		],
+		"relations": [],
+		"limit": 5000
+	}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		service.ConvertQuery(&JSONQuery)
+	}
+}
+
+func BenchmarkConvertTwoRelationQuery(b *testing.B) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+		"return": {
+			"entities": [
+				0,
+				1,
+				2
+			],
+			"relations": [
+				0,
+				1
+			]
+		},
+		"entities": [
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "city",
+						"value": "New York",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			},
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "city",
+						"value": "San Francisco",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			},
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "state",
+						"value": "HI",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			}
+		],
+		"relations": [
+			{
+				"type": "flights",
+				"depth": {
+					"min": 1,
+					"max": 3
+				},
+				"entityFrom": 2,
+				"entityTo": 1,
+				"constraints": [
+					{
+						"attribute": "Day",
+						"value": "15",
+						"dataType": "int",
+						"matchType": "EQ"
+					}
+				]
+			},
+			{
+				"type": "flights",
+				"depth": {
+					"min": 1,
+					"max": 1
+				},
+				"entityFrom": 0,
+				"entityTo": -1,
+				"constraints": []
+			}
+		],
+		"limit": 5000
+	}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		service.ConvertQuery(&JSONQuery)
+	}
+}
diff --git a/cypher/convertQuery_test.go b/cypher/convertQuery_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..c07a06556a6e16f92d52ffae50e7de21d0d75a70
--- /dev/null
+++ b/cypher/convertQuery_test.go
@@ -0,0 +1,894 @@
+package cypher
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+	"testing"
+
+	"git.science.uu.nl/datastrophe/query-conversion/entity"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEmptyQueryConversion(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+		"return": {
+			"entities": [],
+			"relations": []
+		},
+		"entities": [],
+		"relations": [],
+		"limit": 5000
+	}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.NoError(t, err)
+
+	// Assert that the result and the expected result are the same
+	correctConvertedResult := ``
+	assert.Equal(t, correctConvertedResult, *convertedResult)
+}
+
+func TestEntityOneAttributeQuery(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+		"return": {
+			"entities": [
+				0
+			],
+			"relations": []
+		},
+		"entities": [
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "state",
+						"value": "HI",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			}
+		],
+		"relations": [],
+		"limit": 5000
+	}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.NoError(t, err)
+
+	// Assert that the result and the expected result are the same
+	correctConvertedResult := `MATCH (n0:airports)WHERE n0.state = "HI" RETURN n0`
+	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+	assert.Equal(t, correctConvertedResult, cleanedResult)
+}
+
+func TestRelationWithConstraint(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+		"return": {
+			"entities": [
+				0
+			],
+			"relations": [
+				0
+			]
+		},
+		"entities": [
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "state",
+						"value": "HI",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			}
+		],
+		"relations": [
+			{
+				"type": "flights",
+				"depth": {
+					"min": 1,
+					"max": 1
+				},
+				"entityFrom": 0,
+				"entityTo": -1,
+				"constraints": [
+					{
+						"attribute": "Day",
+						"value": "15",
+						"dataType": "int",
+						"matchType": "EQ"
+					}
+				]
+			}
+		],
+		"limit": 5000
+	}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.NoError(t, err)
+
+	// Assert that the result and the expected result are the same
+	correctConvertedResult := `MATCH (n0:airports)WHERE n0.state = "HI" MATCH p0 = (n0)-[r0:flights*1..1]->()WHERE r0.Day = 15 RETURN n0,p0;`
+	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+	assert.Equal(t, correctConvertedResult, cleanedResult)
+}
+
+// func TestModifierCountEntity(t *testing.T) {
+// 	// Setup for test
+// 	// Create query conversion service
+// 	service := NewService()
+
+// 	query := []byte(`{
+// 		"return": {
+// 			"entities": [
+// 				0
+// 			],
+// 			"relations": []
+// 		},
+// 		"entities": [
+// 			{
+// 				"type": "airports",
+// 				"constraints": [
+// 					{
+// 						"attribute": "state",
+// 						"value": "HI",
+// 						"dataType": "string",
+// 						"matchType": "exact"
+// 					}
+// 				]
+// 			}
+// 		],
+// 		"relations": [],
+// 		"limit": 5000,
+// 		"modifiers": [
+// 			{
+// 				"type": "COUNT",
+// 				"selectedType": "entity",
+// 				"id": 0,
+// 				"attributeIndex": -1
+// 			}
+// 		]
+// 	}`)
+
+// 	// Unmarshall the incoming message into an IncomingJSONQuery object
+// 	var JSONQuery entity.IncomingQueryJSON
+// 	json.Unmarshal(query, &JSONQuery)
+
+// 	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+// 	// Assert that there is no error
+// 	assert.NoError(t, err)
+
+// 	// Assert that the result and the expected result are the same
+// 	correctConvertedResult := `LET n0 = (FOR x IN airports FILTER x.state == "HI" RETURN x)RETURN LENGTH (n0)`
+// 	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+// 	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+// 	assert.Equal(t, correctConvertedResult, cleanedResult)
+// }
+
+// func TestModifierCountEntityAttribute(t *testing.T) {
+// 	// Setup for test
+// 	// Create query conversion service
+// 	service := NewService()
+
+// 	query := []byte(`{
+// 		"return": {
+// 			"entities": [
+// 				0
+// 			],
+// 			"relations": []
+// 		},
+// 		"entities": [
+// 			{
+// 				"type": "airports",
+// 				"constraints": [
+// 					{
+// 						"attribute": "state",
+// 						"value": "HI",
+// 						"dataType": "string",
+// 						"matchType": "exact"
+// 					}
+// 				]
+// 			}
+// 		],
+// 		"relations": [],
+// 		"limit": 5000,
+// 		"modifiers": [
+// 			{
+// 				"type": "SUM",
+// 				"selectedType": "entity",
+// 				"id": 0,
+// 				"attributeIndex": 0
+// 			}
+// 		]
+// 	}`)
+
+// 	// Unmarshall the incoming message into an IncomingJSONQuery object
+// 	var JSONQuery entity.IncomingQueryJSON
+// 	json.Unmarshal(query, &JSONQuery)
+
+// 	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+// 	// Assert that there is no error
+// 	assert.NoError(t, err)
+
+// 	// Assert that the result and the expected result are the same
+// 	correctConvertedResult := `LET n0 = (FOR x IN airports FILTER x.state == "HI" RETURN x)RETURN SUM (n0[*].state)`
+// 	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+// 	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+// 	assert.Equal(t, correctConvertedResult, cleanedResult)
+// }
+
+// func TestModifierCountRelation(t *testing.T) {
+// 	// Setup for test
+// 	// Create query conversion service
+// 	service := NewService()
+
+// 	query := []byte(`{
+// 		"return": {
+// 			"entities": [
+// 				0
+// 			],
+// 			"relations": [
+// 				0
+// 			]
+// 		},
+// 		"entities": [
+// 			{
+// 				"type": "airports",
+// 				"constraints": [
+// 					{
+// 						"attribute": "state",
+// 						"value": "HI",
+// 						"dataType": "string",
+// 						"matchType": "exact"
+// 					}
+// 				]
+// 			}
+// 		],
+// 		"relations": [
+// 			{
+// 				"type": "flights",
+// 				"depth": {
+// 					"min": 1,
+// 					"max": 1
+// 				},
+// 				"entityFrom": 0,
+// 				"entityTo": -1,
+// 				"constraints": [
+// 					{
+// 						"attribute": "Day",
+// 						"value": "15",
+// 						"dataType": "int",
+// 						"matchType": "EQ"
+// 					}
+// 				]
+// 			}
+// 		],
+// 		"limit": 5000,
+// 		"modifiers": [
+// 			{
+// 				"type": "COUNT",
+// 				"selectedType": "relation",
+// 				"id": 0,
+// 				"attributeIndex": -1
+// 			}
+// 		]
+// 	}`)
+
+// 	// Unmarshall the incoming message into an IncomingJSONQuery object
+// 	var JSONQuery entity.IncomingQueryJSON
+// 	json.Unmarshal(query, &JSONQuery)
+
+// 	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+// 	// Assert that there is no error
+// 	assert.NoError(t, err)
+
+// 	// Assert that the result and the expected result are the same
+// 	correctConvertedResult := `LET n0 = (FOR x IN airports FILTER x.state == "HI" RETURN x)LET r0 = (FOR x IN n0 FOR v, e, p IN 1..1 OUTBOUND x flights OPTIONS { uniqueEdges: "path" }FILTER p.edges[*].Day ALL == 15 RETURN DISTINCT p )RETURN LENGTH (unique(r0[*].edges[**]))`
+// 	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+// 	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+// 	assert.Equal(t, correctConvertedResult, cleanedResult)
+// }
+// func TestModifierCountRelationAttribute(t *testing.T) {
+// 	// Setup for test
+// 	// Create query conversion service
+// 	service := NewService()
+
+// 	query := []byte(`{
+// 		"return": {
+// 			"entities": [
+// 				0
+// 			],
+// 			"relations": [
+// 				0
+// 			]
+// 		},
+// 		"entities": [
+// 			{
+// 				"type": "airports",
+// 				"constraints": [
+// 					{
+// 						"attribute": "state",
+// 						"value": "HI",
+// 						"dataType": "string",
+// 						"matchType": "exact"
+// 					}
+// 				]
+// 			}
+// 		],
+// 		"relations": [
+// 			{
+// 				"type": "flights",
+// 				"depth": {
+// 					"min": 1,
+// 					"max": 1
+// 				},
+// 				"entityFrom": 0,
+// 				"entityTo": -1,
+// 				"constraints": [
+// 					{
+// 						"attribute": "Day",
+// 						"value": "15",
+// 						"dataType": "int",
+// 						"matchType": "EQ"
+// 					}
+// 				]
+// 			}
+// 		],
+// 		"limit": 5000,
+// 		"modifiers": [
+// 			{
+// 				"type": "AVG",
+// 				"selectedType": "relation",
+// 				"id": 0,
+// 				"attributeIndex": 0
+// 			}
+// 		]
+// 	}`)
+
+// 	// Unmarshall the incoming message into an IncomingJSONQuery object
+// 	var JSONQuery entity.IncomingQueryJSON
+// 	json.Unmarshal(query, &JSONQuery)
+
+// 	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+// 	// Assert that there is no error
+// 	assert.NoError(t, err)
+
+// 	// Assert that the result and the expected result are the same
+// 	correctConvertedResult := `LET n0 = (FOR x IN airports FILTER x.state == "HI" RETURN x)LET r0 = (FOR x IN n0 FOR v, e, p IN 1..1 OUTBOUND x flights OPTIONS { uniqueEdges: "path" }FILTER p.edges[*].Day ALL == 15 RETURN DISTINCT p )RETURN AVG (r0[*].edges[**].Day)`
+// 	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+// 	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+// 	assert.Equal(t, correctConvertedResult, cleanedResult)
+// }
+
+func TestRelationWithInOutConstraint(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+		"return": {
+			"entities": [
+				0,
+				1
+			],
+			"relations": [
+				0
+			]
+		},
+		"entities": [
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "city",
+						"value": "San Francisco",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			},
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "state",
+						"value": "HI",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			}
+		],
+		"relations": [
+			{
+				"type": "flights",
+				"depth": {
+					"min": 1,
+					"max": 3
+				},
+				"entityFrom": 1,
+				"entityTo": 0,
+				"constraints": [
+					{
+						"attribute": "Day",
+						"value": "15",
+						"dataType": "int",
+						"matchType": "EQ"
+					}
+				]
+			}
+		],
+		"limit": 5000
+	}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.NoError(t, err)
+
+	// Assert that the result and the expected result are the same
+	correctConvertedResult := `MATCH (n1:airports)WHERE n1.state = "HI" MATCH p0 = (n1)-[r0:flights*1..3]->(n0)WHERE r0.Day = 15 RETURN n1,n0,p0;`
+	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+	assert.Equal(t, correctConvertedResult, cleanedResult)
+}
+
+func TestTwoRelations(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+		"return": {
+			"entities": [
+				0,
+				1,
+				2
+			],
+			"relations": [
+				0,
+				1
+			]
+		},
+		"entities": [
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "city",
+						"value": "New York",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			},
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "city",
+						"value": "San Francisco",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			},
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "state",
+						"value": "HI",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			}
+		],
+		"relations": [
+			{
+				"type": "flights",
+				"depth": {
+					"min": 1,
+					"max": 3
+				},
+				"entityFrom": 2,
+				"entityTo": 1,
+				"constraints": [
+					{
+						"attribute": "Day",
+						"value": "15",
+						"dataType": "int",
+						"matchType": "EQ"
+					}
+				]
+			},
+			{
+				"type": "flights",
+				"depth": {
+					"min": 1,
+					"max": 1
+				},
+				"entityFrom": 0,
+				"entityTo": -1,
+				"constraints": []
+			}
+		],
+		"limit": 5000
+	}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.NoError(t, err)
+
+	// Assert that the result and the expected result are the same
+	correctConvertedResult := `MATCH (n2:airports)WHERE n2.state = "HI" MATCH p0 = (n2)-[r0:flights*1..3]->(n1)WHERE r0.Day = 15 RETURN n2,n1,p0;MATCH (n0:airports)WHERE n0.city = "New York" MATCH p0 = (n0)-[r0:flights*1..1]->()RETURN n0,p0;`
+	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+	assert.Equal(t, correctConvertedResult, cleanedResult)
+}
+
+func TestRelationWithOnlyToNode(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+			"return": {
+				"entities": [
+					0
+				],
+				"relations": [
+					0
+				]
+			},
+			"entities": [
+				{
+					"type": "airports",
+					"constraints": [
+						{
+							"attribute": "city",
+							"value": "San Francisco",
+							"dataType": "string",
+							"matchType": "exact"
+						}
+					]
+				}
+			],
+			"relations": [
+				{
+					"type": "flights",
+					"depth": {
+						"min": 1,
+						"max": 1
+					},
+					"entityFrom": -1,
+					"entityTo": 0,
+					"constraints": []
+				}
+			],
+			"limit": 5000
+		}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.NoError(t, err)
+
+	// Assert that the result and the expected result are the same
+	correctConvertedResult := `MATCH (n0:airports)WHERE n0.city = "San Francisco" MATCH p0 = (n0)-[r0:flights*1..1]->()RETURN n0,p0;`
+	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+	assert.Equal(t, correctConvertedResult, cleanedResult)
+}
+
+func TestTooManyReturnEntities(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+			"return": {
+				"entities": [
+					0,
+					1,
+					2
+				],
+				"relations": [
+					0
+				]
+			},
+			"entities": [
+				{
+					"type": "airports",
+					"constraints": [
+						{
+							"attribute": "city",
+							"value": "San Francisco",
+							"dataType": "string",
+							"matchType": "exact"
+						}
+					]
+				}
+			],
+			"relations": [
+				{
+					"type": "flights",
+					"depth": {
+						"min": 1,
+						"max": 1
+					},
+					"entityFrom": -1,
+					"entityTo": 0,
+					"constraints": []
+				}
+			],
+			"limit": 5000
+		}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	_, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.Equal(t, errors.New("non-existing entity referenced in return"), err)
+}
+
+func TestTooManyReturnRelations(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+			"return": {
+				"entities": [
+					0
+				],
+				"relations": [
+					0,
+					1,
+					2
+				]
+			},
+			"entities": [
+				{
+					"type": "airports",
+					"constraints": [
+						{
+							"attribute": "city",
+							"value": "San Francisco",
+							"dataType": "string",
+							"matchType": "exact"
+						}
+					]
+				}
+			],
+			"relations": [
+				{
+					"type": "flights",
+					"depth": {
+						"min": 1,
+						"max": 1
+					},
+					"entityFrom": -1,
+					"entityTo": 0,
+					"constraints": []
+				}
+			],
+			"limit": 5000
+		}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	_, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.Equal(t, errors.New("non-existing relation referenced in return"), err)
+}
+
+func TestNegativeReturnEntities(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+			"return": {
+				"entities": [
+					0,
+					-1
+				],
+				"relations": [
+					0,
+					1,
+					2
+				]
+			},
+			"entities": [
+				{
+					"type": "airports",
+					"constraints": [
+						{
+							"attribute": "city",
+							"value": "San Francisco",
+							"dataType": "string",
+							"matchType": "exact"
+						}
+					]
+				}
+			],
+			"relations": [
+				{
+					"type": "flights",
+					"depth": {
+						"min": 1,
+						"max": 1
+					},
+					"entityFrom": -1,
+					"entityTo": 0,
+					"constraints": []
+				}
+			],
+			"limit": 5000
+		}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	_, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.Equal(t, errors.New("non-existing entity referenced in return"), err)
+}
+
+func TestNoRelationsField(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+			"return": {
+				"entities": [
+					0
+				]
+			},
+			"entities": [
+				{
+					"type": "airports",
+					"constraints": [
+						{
+							"attribute": "city",
+							"value": "San Francisco",
+							"dataType": "string",
+							"matchType": "exact"
+						}
+					]
+				}
+			],
+			"limit": 5000
+		}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	convertedResult, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.NoError(t, err)
+
+	// Assert that the result and the expected result are the same
+	correctConvertedResult := `MATCH (n0:airports)WHERE n0.city = "San Francisco" RETURN n0`
+	cleanedResult := strings.ReplaceAll(*convertedResult, "\n", "")
+	cleanedResult = strings.ReplaceAll(cleanedResult, "\t", "")
+	assert.Equal(t, correctConvertedResult, cleanedResult)
+}
+
+func TestEntityFromLowerThanNegativeOneInRelation(t *testing.T) {
+	// Setup for test
+	// Create query conversion service
+	service := NewService()
+
+	query := []byte(`{
+			"return": {
+				"entities": [
+					0
+				],
+				"relations": [
+					0
+				]
+			},
+			"entities": [
+				{
+					"type": "airports",
+					"constraints": [
+						{
+							"attribute": "city",
+							"value": "San Francisco",
+							"dataType": "string",
+							"matchType": "exact"
+						}
+					]
+				}
+			],
+			"relations": [
+				{
+					"type": "flights",
+					"depth": {
+						"min": 1,
+						"max": 1
+					},
+					"entityFrom": -4,
+					"entityTo": 0,
+					"constraints": []
+				}
+			],
+			"limit": 5000
+		}`)
+
+	// Unmarshall the incoming message into an IncomingJSONQuery object
+	var JSONQuery entity.IncomingQueryJSON
+	json.Unmarshal(query, &JSONQuery)
+
+	_, err := service.ConvertQuery(&JSONQuery)
+
+	// Assert that there is no error
+	assert.NoError(t, err)
+}
diff --git a/cypher/createConstraints.go b/cypher/createConstraints.go
new file mode 100644
index 0000000000000000000000000000000000000000..b24d895f7c9afbccd519bc4c6ec3c9fecd89de9a
--- /dev/null
+++ b/cypher/createConstraints.go
@@ -0,0 +1,101 @@
+package cypher
+
+import (
+	"fmt"
+
+	"git.science.uu.nl/datastrophe/query-conversion/entity"
+)
+
+/* createConstraintStatements generates the appropriate amount of constraint lines calling createConstraingBoolExpression
+Parameters: constraints is a list of constraintStructs that specify the constraints of a node or relation,
+name is the id of the corresponding relation/node,
+isRelation is a boolean specifying if this constraint comes from a node or relation
+
+Return: a string containing a FILTER-statement with all the constraints
+*/
+func createConstraintStatements(constraints *[]entity.QueryConstraintStruct, name string) *string {
+	s := ""
+	if len(*constraints) == 0 {
+		return &s
+	}
+
+	newLineStatement := "\tWHERE"
+
+	for _, v := range *constraints {
+		s += fmt.Sprintf("%v%v \n", newLineStatement, *createConstraintBoolExpression(&v, name))
+		newLineStatement = "\tAND"
+	}
+
+	return &s
+}
+
+/* createConstraintBoolExpression generates a single boolean expression,
+e.g. {name}.city == "New York".
+
+Parameters: constraint is a single constraint of a node or relation,
+name is the id of the corresponding relation/node,
+isRelation is a boolean specifying if this constraint comes from a node or relation, that changes the structure of the expression
+
+Return: a string containing an boolean expression of a single constraint
+*/
+func createConstraintBoolExpression(constraint *entity.QueryConstraintStruct, name string) *string {
+	var (
+		match string
+		value string
+		line  string
+		neq   string
+	)
+
+	// Constraint datatypes back end
+	// string		  MatchTypes: EQ/NEQ/contains/excludes
+	// int     MatchTypes: EQ/NEQ/GT/LT/GET/LET
+	// bool       MatchTypes: EQ/NEQ
+
+	neq = ""
+
+	switch constraint.DataType {
+	case "string":
+		value = fmt.Sprintf("\"%s\"", constraint.Value)
+		switch constraint.MatchType {
+		case "NEQ":
+			match = "<>"
+		case "contains":
+			match = "CONTAINS"
+			value = fmt.Sprintf("\"%%%s%%\"", constraint.Value)
+		case "excludes":
+			match = "CONTAINS"
+			value = fmt.Sprintf("\"%%%s%%\"", constraint.Value)
+			neq = "NOT"
+		default: //EQ
+			match = "="
+		}
+	case "int":
+		value = constraint.Value
+		switch constraint.MatchType {
+		case "NEQ":
+			match = "<>"
+		case "GT":
+			match = ">"
+		case "LT":
+			match = "<"
+		case "GET":
+			match = ">="
+		case "LET":
+			match = "<="
+		default: //EQ
+			match = "="
+		}
+	default: /*bool*/
+		value = constraint.Value
+		switch constraint.MatchType {
+		case "NEQ":
+			match = "<>"
+		default: //EQ
+			match = "="
+		}
+	}
+
+	line = fmt.Sprintf("%s %s.%s %s %s", neq, name, constraint.Attribute, match, value)
+
+	return &line
+}
diff --git a/cypher/queryConverter.go b/cypher/queryConverter.go
new file mode 100644
index 0000000000000000000000000000000000000000..70967b8cf99ba3252c3368ea205e6f5640248d6d
--- /dev/null
+++ b/cypher/queryConverter.go
@@ -0,0 +1,20 @@
+/*
+This program has been developed by students from the bachelor Computer Science at Utrecht University within the Software Project course.
+© Copyright Utrecht University (Department of Information and Computing Sciences)
+*/
+
+package cypher
+
+/*
+Service implements the QueryConverter interface (in the query service)
+*/
+type Service struct {
+}
+
+/*
+NewService creates a new AQL conversion service
+	Return: *Service, the new service
+*/
+func NewService() *Service {
+	return &Service{}
+}
diff --git a/entity/queryStruct.go b/entity/queryStruct.go
index 9dd51dcc1e3a1c5a71a890483ca37175bb16502d..7b6c2760ac2ad7c0b1a002c516559011a85cdd5d 100644
--- a/entity/queryStruct.go
+++ b/entity/queryStruct.go
@@ -49,8 +49,8 @@ type QuerySearchDepthStruct struct {
 
 // QueryConstraintStruct holds the information of the constraint
 // Constraint datatypes
-// 	text     MatchTypes: exact/contains/startswith/endswith
-// 	number   MatchTypes: GT/LT/EQ
+// 	string     MatchTypes: exact/contains/startswith/endswith
+// 	int   MatchTypes: GT/LT/EQ
 // 	bool     MatchTypes: EQ/NEQ
 type QueryConstraintStruct struct {
 	Attribute string
diff --git a/main/main.go b/main/main.go
new file mode 100644
index 0000000000000000000000000000000000000000..b2c863a8436360e1a0d2e0f4e185c4a83d5b3080
--- /dev/null
+++ b/main/main.go
@@ -0,0 +1,48 @@
+/*
+This program has been developed by students from the bachelor Computer Science at Utrecht University within the Software Project course.
+© Copyright Utrecht University (Department of Information and Computing Sciences)
+*/
+
+package main
+
+import (
+	"encoding/json"
+	"log"
+
+	"git.science.uu.nl/datastrophe/query-conversion/cypher"
+	"git.science.uu.nl/datastrophe/query-conversion/entity"
+)
+
+/*
+The main function that calls the appropriate functions
+*/
+func main() {
+	queryservice := cypher.NewService()
+
+	js := []byte(`{
+		"return": {
+			"entities": [
+				0
+			]
+		},
+		"entities": [
+			{
+				"type": "airports",
+				"constraints": [
+					{
+						"attribute": "city",
+						"value": "San Francisco",
+						"dataType": "string",
+						"matchType": "exact"
+					}
+				]
+			}
+		],
+		"limit": 5000
+	}`)
+
+	var inc entity.IncomingQueryJSON
+	json.Unmarshal(js, &inc)
+	result, _ := queryservice.ConvertQuery(&inc)
+	log.Println(*result)
+}
diff --git a/main/node_modules/.yarn-integrity b/main/node_modules/.yarn-integrity
new file mode 100644
index 0000000000000000000000000000000000000000..1a3aded6105fb67caa747e15081dd1543f4cb74b
--- /dev/null
+++ b/main/node_modules/.yarn-integrity
@@ -0,0 +1,10 @@
+{
+  "systemParams": "win32-x64-72",
+  "modulesFolders": [],
+  "flags": [],
+  "linkedModules": [],
+  "topLevelPatterns": [],
+  "lockfileEntries": {},
+  "files": [],
+  "artifacts": {}
+}
\ No newline at end of file
diff --git a/main/yarn.lock b/main/yarn.lock
new file mode 100644
index 0000000000000000000000000000000000000000..fb57ccd13afbd082ad82051c2ffebef4840661ec
--- /dev/null
+++ b/main/yarn.lock
@@ -0,0 +1,4 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+